The invention relates to the field of environmental protection, more specifically to the field of processing radioactive waste, and can he used for the safe and effective handling of a large quantity of liquid radioactive waste of various activity levels that has been formed as the result of decontaminating protective equipment of boxes and chambers, and makes it possible to decrease the volume of stored waste by solidifying same and incorporating same into a ceramic matrix. For this purpose, radioactive solutions after decontamination of surfaces of protective equipment are evaporated as alkaline and acidic solutions containing sodium hydroxide, potassium permanganate, oxalic acid, and nitric acid until a solid residue forms, and are calcined, and the calcinate is mixed with components of a fusion mixture containing oxides of titanium, calcium, iron (III), zirconium, and manganese (IV) and aluminum in a specified ratio, and fused.

A fused grain is essentially composed of a matrix of a magnesium aluminum oxide of MgAl.sub.2O.sub.4 spinel structure and/or of the MgOMgAl.sub.2O.sub.4 eutectic structure, and of inclusions essentially composed of magnesium oxide. The grain has the following overall chemical composition, as percentages by weight, expressed in the form of oxides: more than 5.0% and less than 19.9% of Al.sub.2O.sub.3, Al.sub.2O.sub.3 and MgO together represent more than 95.0% of the weight of the grain. The cumulative content of CaO and of ZrO.sub.2 is less than 4000 ppm, by weight.

Electronic devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-titanium-tungsten-silicon oxide.

The present disclosure relates to the field of ceramics, and discloses a metal-based aluminum nitride composite material. The composite material includes an aluminum nitride ceramic skeleton and a metal filling at least part of pores of the aluminum nitride ceramic skeleton. The aluminum nitride ceramic skeleton contains aluminum nitride and CuAlO.sub.2, and the aluminum nitride ceramic skeleton has a porosity of 20 to 40 percent. The present disclosure further discloses a method for preparing the metal-based aluminum nitride composite material and the metal-based aluminum nitride composite material obtained by the method. A CuAlO.sub.2 substance is formed in the aluminum nitride ceramic skeleton obtained in the present disclosure.

Method for manufacturing porous products consisting essentially of titanium suboxide(s) of general formula TiOx, the value of x being between 1.6 and 1.9, the method including a) mixing the raw materials including at least one source of titanium dioxide, a reducing agent comprising carbon, b) forming the product, c) optionally, in particular when organic products are used during step a), thermal treatment under air or an oxidizing atmosphere, d) sintering, for example at a temperature above 1150 C. but not exceeding 1430 C., under a neutral or reducing atmosphere, in which the source of titanium dioxide consists of at least 55 wt % of anatase.

The light shielding member of the present disclosure includes an aluminum oxide ceramics including an oxide of titanium whose composition formula is shown as TiO.sub.2-x (1?x<2), and a total content of Fe, Ni, Co, Mn and Cr is 260 mass ppm or less.

A ceramic substrate and a method for production thereof are provided, in which the ceramic substrate includes a composite of: a first ceramic layer including Sr anorthite and Al.sub.2O.sub.3 or an oxide dielectric with a dielectric constant higher than that of Al.sub.2O.sub.3; and a second ceramic layer including Sr anorthite and cordierite and having a dielectric constant lower than that of the first ceramic layer.

Presented here are nanocomposites and rechargeable batteries. In certain embodiments, nanocomposites a nanocomposite is resistant to thermal runaway, and useful as an electrode material in rechargeable batteries that are safe, reliable, and stable when operated at high temperature and high pressure. The present disclosure also provides methods of preparing rechargeable batteries. For example, rechargeable batteries that include nanocomposites of the present disclosure as an electrode material have, in some embodiments, an enhanced performance and stability over a broad temperature range from room temperature to high temperatures. These batteries fill an important need by providing a safe and reliable power source for devices operated at high temperatures and pressures such as downhole equipment used in the oil industry.

The present disclosure relates to the technical field of electronic materials. A low-dielectric wollastonite based low-temperature co-fired ceramic material and a preparation method therefor are provided. The formula of the ceramic material is: Ca.sub.xSiO.sub.3+awt % SiO.sub.2+bwt % R.sub.2O+cwt % Bi.sub.2O.sub.3+dwt % B.sub.2O.sub.3+ewt % MO, wherein 0.9?x?1.1, 0<a?30, 1?b?5, 0<c?3, 0<d?6, 0?e?10, R.sub.2O is at least one of Li.sub.2O and K.sub.2O, and MO is one or more of ZnO, MgO, BaO, CoO, CuO, La.sub.2O.sub.3 and MnO.sub.2. The low-temperature co-fired ceramic material provided by the present disclosure satisfies the requirements of low dielectric, low loss and low-temperature sintering, and can be applied to the fields of millimeter wave LTCC devices and the like.

Ceramic particles for use in a solar power tower and methods for making and using the ceramic particles are disclosed. The ceramic particle can include a sintered ceramic material formed from a mixture of a ceramic raw material and a darkening component comprising MnO as Mn.sup.2+. The ceramic particle can have a size from about 8 mesh to about 170 mesh and a density of less than 4 g/cc.